Detect the Native Crypto Environment in JavaScript

crypto_env.js

var CryptoEnv = {};

(function () {
  var exports = (typeof module !== 'undefined' && module.exports)  || window.CryptoEnv;
  var node = (typeof module !== 'undefined');
  var crypto;
  if(node){
    crypto = require('crypto');
  }else{
    crypto = (window.crypto && crypto.subtle) ||
    (window.crypto && crypto.webkitSubtle) ||
    (window.msCrypto && window.msCrypto.Subtle);
  
    if (!cryptoSubtle) {
      throw new Error('crypto.subtle not found');
    }
  }
  
  exports.check = function () {
    if(node){
      console.log("Node.JS");
    }else{
      console.log("Browser");
    }
  }
})();